Watch casing and a portion of a strap



FIG. 1 is a perspective view of a watch casing and a portion of a strap showing my new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a first end view thereof;

FIG. 5 is a second end view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines indicated in the figures are boundary lines wherein the portions of the article within the boundary lines form no part of the claimed design. 

CLAIM The ornamental design for a watch casing and a portion of a strap, as shown and described. 